Nancy took her temperature and found she had a ______.

News has spread ______MrSmith has two people over him in this department

＿＿＿＿＿ is our duty ＿＿＿＿＿ the environment.

How do you like the set of popular science books?——Wonderful! It _____ many problems we are interested in exploring.

_______ such heavy pollution already, it may now be too late to clean up the river. [ ]